Ink level chips (auto-reset) CAN 520/521	Cartridge chips for PGI-520BK and CLI-521BK / C / M / Y ink tanks Only suitable for PGI-520 and CLI-521 tanks - not compatible with 820/821, 220/221 cartridges Fit refillable or genuine Canon 520/521 cartridges. Select the individual chips you want from "colour" menu then click "buy".   QTY: colour 520 black 521B black 521C cyan 521M magenta 521Y yellow